Cold Fish - trailer (Movie)

Cold Fish (冷たい熱帯魚 Tsumetai Nettaigyo?) is a 2010 Japanese serial killer film directed by Sion Sono. The film is about a quiet and unambitious owner of a tropical fish shop who's life and family are taken over by a fellow fish entrepreneur who happens to be a serial killer. The film is loosely based off the exploits of two Tokyo serial killers, Sekine Gen and Hiroko Kazama, a husband and wife duo who owned a pet shop and murdered at least four people.

text source: wikipedia.org